I will review several approaches to the emergence of general relativity. The talk will begin with a brief overview of the four laws of black hole dynamics and how the generalized second law of thermodynamics motivates entropy bounds. I will then discuss different types of entropy bounds, focusing in particular on Bousso’s bound, which is widely regarded as the most successful. This will lead to the holographic principle and its realization in the AdS/CFT correspondence. The main part of the talk will focus on Jacobson’s and Verlinde’s approaches to emergent gravity. I will conclude by discussing the role of generalized entropies in this context and how they can lead to modifications of the Friedmann equation.